Can anyone explain to me the fees charged at an airport? I flew in to Guadalajara yesterday and picked up 2 passengers (the aircraft owner and his wife) to travel back to the US. We were charged over $700 USD for a list of items (mostly international customs) over and above the cost of fuel (and I was only there for 45 minutes. I tried to explain it was a private flight and the PAX were the aircraft owners who have a winter residence there, but it made no difference, even after I showed them the notarized Private Operations letter. They simply said charges applied to all international flights.

We have been flying into Guaymas for over 2 years and have never incurred these expenses. I could see a couple hundred dollars more since it is a larger airport with excellent services...but $700 more?

Just looking for info so I can answer the owner's questions. Thanks!
Jim